JP2012153223A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To linearly bring a relationship between opening and temperature control of an air mix damper closer together by reducing a pressure difference between cold air flowing into an air mix space from a cooling passage, and hot air flowing into the air mix space from a heating passage.SOLUTION: An air conditioner 1 includes an evaporator 30 cooling air conditioning air, a heater core 31 heating the air conditioning air, and a casing 36. A cooling passage 51 arranged with the evaporator 30, a heating passage 53 arranged with the heater core 31, an air mix space 55, and a bypass passage 57 formed so as to bypass a portion arranged with the evaporator 30 in the cooling passage 51 and to extend and communicated with the heating passage 53 are formed in the casing 36. An air mix damper 32 changing a ratio between an amount of the cold air flowing into the air mix space 55 from the cooling passage 51, and an amount of the hot air flowing into the air mix space 55 from the heating passage 53 is disposed in the casing 36.

Description

  The present invention relates to a vehicle air conditioner mounted on, for example, an automobile.

  Conventionally, vehicle air conditioners are configured to generate conditioned air at a desired temperature using a cooling heat exchanger and a heating heat exchanger. That is, in the air conditioner of Patent Document 1, in the casing that houses the heat exchanger, a cooling passage in which the cooling heat exchanger is disposed, a heating passage in which the heating heat exchanger is disposed, and the cold air that has passed through these passages And an air mix space into which warm air flows. The downstream side of the cooling passage is branched into two, one communicating with the heating passage and the other communicating with the air mix space. The amount of cold air and the amount of hot air flowing into the air mix space are changed by the air mix damper disposed in the casing.

  Therefore, in the vehicle air conditioner, the air sent from the blower first flows through the cooling passage and passes through the cooling heat exchanger, and then partially flows into the air mix space and the rest flows through the heating passage. After passing through the heat exchanger for heating, it flows into the air mix space. For this reason, the hot air blown out from the heating passage to the air mix space passes through the two heat exchangers for cooling and heating, so that the pressure is lower than that of the cold air, and for example, the air mix damper is used during temperature control. When it is activated and the cooling passage is opened slightly, the cold air with high pressure overcomes the warm air, and the cold air flows into the air mix space vigorously, and the temperature of the conditioned air rapidly decreases. It may be difficult to have a linear relationship with temperature control.

  If the opening degree of the air mix damper and the temperature control are not in a linear relationship, the operation of the air mix damper must be made non-linear, and the structure of the drive mechanism becomes complicated.

  Further, for example, as disclosed in Patent Document 2, a vehicle air conditioner provided with a bypass passage for allowing a part of air blown from a blower to flow by bypassing a cooling heat exchanger is known. ing. The downstream end of the bypass passage communicates with the downstream side of the cooling passage, and the air bypassing the cooling heat exchanger flows into the air mix space from the cooling passage.

JP 2009-78811 A Japanese Patent Laid-Open No. 2000-219028

  By the way, the bypass passage of patent document 2 is provided in the air conditioner of patent document 1 to suppress the temperature drop of the cold air, and thereby, the rapid temperature drop of conditioned air when the cooling passage is slightly opened is considered. It is done.

  However, since the downstream end of the bypass passage in Patent Document 2 communicates with the downstream side of the cooling passage, the air that has flowed through the bypass passage flows into the cooling passage again. Therefore, the difference between the pressure of the cold air blown from the cooling passage and the pressure of the hot air blown from the heating passage remains large, and as a result, the relationship between the opening degree of the air mix damper and the temperature control is unlikely to be linear.

  The present invention has been made in view of such a point, and an object of the present invention is to reduce the pressure difference between the cool air flowing from the cooling passage into the air mix space and the warm air flowing from the heating passage into the air mix space. Thus, the relationship between the opening degree of the air mix damper and the temperature control is brought close to linear.

  In order to achieve the above object, in the present invention, the downstream end of the bypass passage for bypassing the cooling heat exchanger is communicated with the heating passage, not the cooling passage.

  1st invention is the heat exchanger for cooling which cools the air for air conditioning, the heat exchanger for heating which heats the air for air conditioning, the casing which accommodates the said heat exchanger for cooling, and the said heat exchanger for heating, A vehicle air conditioner configured to supply air conditioning air introduced into the casing through the cooling heat exchanger and the heating heat exchanger to be conditioned air and then supplied to the vehicle interior. In the casing, a cooling passage in which the cooling heat exchanger is disposed, a heating passage in communication with a portion of the cooling passage downstream and the heating heat exchanger is disposed, and the cooling passage An air mix space in which the other downstream side of the heating passage and the downstream end of the heating passage communicate with each other, and a portion where the cooling heat exchanger is disposed in the cooling passage, are formed so as to extend to the heating passage. Communication And an air mix damper for changing a ratio of the amount of cold air flowing from the cooling passage into the air mix space and the amount of hot air flowing from the heating passage into the air mix space. It is characterized by being.

  According to this configuration, since a part of the air introduced into the casing flows through the bypass passage and flows into the heating passage, the pressure of the cold air flowing from the cooling passage into the air mix space is lower than the conventional one. At the same time, the pressure of the hot air flowing into the air mix space from the heating passage increases.

  As a result, the pressure difference between the cold air flowing from the cooling passage into the air mix space and the warm air flowing from the heating passage into the air mix space is reduced, so the air mixing damper is operated during temperature control to slightly open the cooling passage. When this occurs, the phenomenon of cold air flowing into the air mix space is suppressed, and the temperature of the conditioned air is gradually reduced.

  The second invention is characterized in that, in the first invention, an opening / closing member for opening / closing the bypass passage is disposed in the casing.

  According to this configuration, it is possible to positively control the temperature of the conditioned air generated in the air mix space by opening and closing the bypass passage.

  According to a third invention, in the first or second invention, the heating passage is defined below the air mix space, and a downstream side of the heating passage communicates with a lower portion of the air mix space, The downstream side communicates with the lower part of the heating passage.

  According to this configuration, the air in the heating passage flows upward and flows into the air mix space. At this time, since the downstream side of the bypass passage communicates with the lower portion of the heating passage, the air in the bypass passage rides on the air flow in the heating passage and flows into the air mix space.

  4th invention is equipped with the air blower which blows the air for an air conditioning in any one invention of 1st to 3, The said air blower is the vehicle width direction one side of the casing which accommodates the heat exchanger for cooling and heating The casing is connected to a duct for introducing air conditioning air blown from the blower into the casing, and the upstream side of the bypass passage is connected to the duct. It is characterized by that.

  According to this configuration, since air in the duct is diverted to the bypass passage, it is possible to cope with a case where the amount of air to be bypassed is small.

  5th invention is equipped with the air blower which blows the air for an air conditioning in any one invention of 1st to 3, The said air blower is the vehicle width direction one side of the casing which accommodates the heat exchanger for cooling and heating The upstream side of the bypass passage is in communication with the downstream side in the flow direction of the air blown from the blower in the casing.

  According to this configuration, the air-conditioning air blown from the blower is introduced into the casing and flows vigorously toward the downstream side in the casing. Since the bypass passage communicates with the downstream side, a sufficient amount of air flows into the bypass passage.

  According to the first aspect of the invention, the bypass passage that bypasses the cooling heat exchanger is connected to the heating passage, so that the cold air that flows from the cooling passage to the air mix space and the hot air that flows from the heating passage to the air mix space And the pressure difference can be reduced. Thereby, the relationship between the opening degree of an air mix damper and temperature control can be approximated linearly.

  According to the second invention, the temperature of the conditioned air can be positively controlled by opening and closing the bypass passage, and passenger comfort can be further improved.

  According to the third aspect of the invention, the heating passage is partitioned and formed below the air mix space, the downstream side of the heating passage is communicated with the lower portion of the air mix space, and the downstream side of the bypass passage is communicated with the lower portion of the heating passage. Therefore, the air in the bypass passage can be smoothly flown into the air mix space by being put on the air flow in the heating passage.

  According to the fourth aspect of the invention, since the upstream side of the bypass passage is connected to the duct for introducing the air-conditioning air blown from the blower into the casing and is divided into the bypass passage, the amount of air to be bypassed is A simple structure can be used when less is required.

  According to the fifth invention, since the upstream side of the bypass passage communicates with the downstream side in the flow direction of the air blown from the blower in the casing, the air-conditioning air that has flowed to the downstream side flows into the bypass passage. It becomes easy to do. Thereby, it is possible to secure a sufficient amount of air to be bypassed.

1 is a front view of an air conditioner according to Embodiment 1. FIG. It is a figure which shows the internal structure of the air conditioning unit at the time of bilevel mode. FIG. 3 is a view corresponding to FIG. 2 in a differential heat mode. It is a longitudinal cross-sectional view of the air conditioning unit concerning the modification 1 of Embodiment 1. FIG. FIG. 5 is a diagram corresponding to FIG. 4 according to a second modification of the first embodiment. FIG. 6 is a view corresponding to FIG. 4 according to a third modification of the first embodiment. FIG. 3 is a diagram corresponding to FIG. 2 according to the second embodiment. It is a horizontal sectional view of an air conditioner concerning Embodiment 3. FIG. 9 is a diagram corresponding to FIG. 8 according to the fourth embodiment. FIG. 9 is a diagram corresponding to FIG. 8 according to the fifth embodiment. FIG. 10 is a view corresponding to FIG. 8 according to a modification of the fifth embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

(Embodiment 1)
FIG. 1 shows a vehicle air conditioner 1 according to Embodiment 1 of the present invention. The air conditioner 1 is housed in an instrument panel (not shown) disposed at the front end of the interior of the automobile. This automobile is a so-called right-hand drive vehicle in which a driver's seat is provided on the right side of the vehicle, but the present invention can also be applied to a left-hand drive vehicle.

In the description of this embodiment, the left side of the vehicle is simply referred to as “left” and the right side of the vehicle is simply “right”.
The front side of the vehicle is simply referred to as “front”, and the rear side of the vehicle is simply referred to as “rear”.

  The air conditioner 1 includes an air blowing unit 3 for blowing air for air conditioning, an air conditioning unit 4 for adjusting the temperature of the air conditioning air blown from the air blowing unit 3 and supplying the air conditioning air to each part of the passenger compartment, and the air blowing unit 3. And an intermediate duct 5 for connecting the air conditioning unit 4.

  The blower unit 3 is disposed on the passenger seat side (left side) in the instrument panel, and a blower fan (blower) 10, a blower casing 11 that houses the blower fan 10, and a motor 12 that rotationally drives the blower fan 10. And. The blower casing 11 is formed by molding a resin material.

  An inside / outside air switching portion 11a is provided in the upper half of the blower casing 11, and a fan accommodating portion 11b is provided in the lower portion. The inside / outside air switching unit 11a is for selectively switching the air introduced into the blower casing 11 to one of the air inside the vehicle compartment and the air outside the vehicle compartment, and includes an outside air introduction port 11c and an inside air introduction port (see FIG. And an inside / outside air switching damper (not shown) that closes one of the inlets 11c and opens the other.

  The blower fan 10 is a centrifugal fan, and is housed in the fan housing portion 11b with a rotational axis extending in the vertical direction. The output shaft of the motor 12 is connected to the rotation shaft. The fan accommodating part 11b is formed so that the circumference | surroundings of the fan 10 may be enclosed, and the air blowing part is located in the right side. Therefore, when the motor 12 operates and the blower fan 10 rotates, the air introduced from the outside air introduction port 11c or the inside air introduction port blows out from the right side of the fan housing portion 11b.

  The intermediate duct 5 is disposed between the blower unit 3 and the air conditioning unit 4 and extends in the left-right direction. The left end portion of the intermediate duct 5 is connected to the air blowing portion of the fan housing portion 11b.

  As shown in FIG. 2, the air conditioning unit 4 includes an evaporator 30, a heater core 31, an air mix damper 32, a defroster damper 33, a vent damper 34, a heat damper 35, a bypass passage opening / closing damper (opening / closing member) 37, And an air conditioning casing 36 for housing them.

  The evaporator 30 is a cooling heat exchanger for cooling the air-conditioning air, and is composed of an evaporator that is an element of the refrigeration cycle. The heater core 31 is a heating heat exchanger for heating the air-conditioning air, and the cooling water of the engine mounted on the vehicle is circulated.

  The air conditioning casing 36 is made of a resin material, and is divided into two in the left-right direction as shown in FIG. As shown in FIG. 2, an air intake 40 is formed in the front portion of the left side wall of the air conditioning casing 36. The right end of the intermediate duct 5 is connected to the air intake port 40.

  A cooling passage 51 that communicates with the air intake port 40 and extends rearward is formed in the front portion of the air conditioning casing 36. The evaporator 30 is disposed in the cooling passage 51. The evaporator 30 has a posture in which the air surface extends substantially vertically, and an upper portion and a lower portion are respectively held by the air conditioning casing 36.

  A drainage channel 48 a for draining the condensed water generated in the evaporator 30 is formed in the holding portion 48 that holds the lower portion of the evaporator 30. The drainage channel 48 a is connected to a drain pipe 49 formed at the lower end of the air conditioning casing 36.

  The downstream side of the cooling passage 51 is branched into two vertically and communicates with an upper opening 52 a and a lower opening 52 b formed in the partition wall 52 in the casing 36. A heating passage 53 is formed on the rear side of the cooling passage 51 in the lower part of the air conditioning casing 36. The upstream side of the heating passage 53 communicates with the lower opening 52b. The heater core 31 is disposed in the middle portion of the heating passage 53. The heater core 31 is inclined such that the air passage surface is positioned further toward the upper side, and the upper and lower portions are respectively held by the air conditioning casing 36.

  The upstream side of the heating passage 53 extends downward from the lower opening 52b. On the other hand, the downstream side of the heater core 31 in the heating passage 53 extends upward. Therefore, the heating passage 53 has a bent shape close to a U-shape as a whole.

  An air mix space 55 is formed above the heating passage 53 in the air conditioning casing 36. An upper opening 52 a communicates with the front portion of the air mix space 55. Further, the downstream side of the heating passage 53 communicates with the lower portion of the air mix space 55. Accordingly, the cold air flows into the air mix space 55 from the front side toward the rear side, while the warm air flows from the lower side toward the upper side. The warm air and cold air that have flowed into the air mix space 55 are mixed in the air mix space 55.

  The air mixing damper 32 is a plate damper, and is configured to selectively open and close the first opening 52a and the second opening 52b. That is, the air mix damper 23 includes a rotation shaft 32a extending in the left-right direction and a closing plate 32b extending in the radial direction of the rotation shaft 32a. The rotation shaft 32a is rotatably supported on the left and right side walls of the air conditioning casing 36 and is driven by an actuator (not shown). The closing plate 32b is for opening one of the upper opening 52a and the lower opening 52b and closing the other.

  The rotation range of the air mix damper 32 is from a position where the upper opening 52a is fully closed to a position where the lower opening 52b is fully closed. It stops at an arbitrary position within this range. Depending on the position of the air mix damper 32, the ratio of the amount of cool air flowing from the cooling passage 51 into the air mix space 55 and the amount of hot air flowing from the heating passage 53 into the air mix space 55 is changed.

A bypass passage 57 is formed in the lower part of the air conditioning casing 36. The bypass passage 57 is for communicating the upstream side of the portion of the cooling passage 51 where the evaporator 30 is disposed with the upstream side of the portion of the heating passage 53 where the heater core 31 is disposed. Extending in the direction. The bypass passage 57 is located directly below the evaporator 30. Therefore, the air-conditioning air that has flowed into the cooling passage 51 from the air intake 40 is divided into air that passes through the evaporator 30 and air that passes through the bypass passage 57. The amount of air passing through the bypass passage 57 is significantly smaller than the amount of air passing through the evaporator 30.
The downstream end opening of the bypass passage 57 faces the lower part of the air passage surface of the heater core 31.

  A defroster outlet 60 communicating with the air mix space 55 is formed on the upper wall portion of the air conditioning casing 36. A defroster duct (not shown) is connected to the defroster outlet 60. The downstream end of the defroster duct is connected to a defroster nozzle included in the instrument panel. The defroster nozzle is for supplying conditioned air to the inner surface of the front window glass.

  The defroster damper 33 is disposed above the air mix space 55 in the air conditioning casing 36. The defroster damper 33 is a so-called butterfly damper including a rotation shaft 33a extending in the left-right direction and blocking plates 33b and 33b extending on both sides in the radial direction of the rotation shaft 33a. The rotation shaft 33a is rotatably supported on the left and right side walls of the air conditioning casing 36. The defroster blower outlet 60 is opened and closed by the defroster damper 33.

  A vent outlet 61 is formed above the rear wall of the air conditioning casing 36. A vent duct (not shown) is connected to the vent outlet 61. The downstream end of the vent duct is connected to a vent nozzle included in the instrument panel. The vent nozzle is mainly for supplying conditioned air to the upper body of the front seat occupant.

  The vent damper 34 is disposed behind the upper side of the air mix space 55 in the air conditioning casing 36. The vent damper 34 is a butterfly damper configured in the same manner as the defroster damper 33, and includes a rotation shaft 34a extending in the left-right direction and blocking plates 34b and 34b. The rotation shaft 34 a is rotatably supported on the left and right side walls of the air conditioning casing 36. The vent air outlet 61 is opened and closed by the vent damper 34.

  A front seat heat outlet 62 and a rear seat heat outlet 63 are formed on the rear side of the lower portion of the air conditioning casing 36. A front seat heat duct (not shown) is connected to the front seat heat outlet 62. The front seat heat duct extends to the vicinity of the feet of the front seat occupant.

  A rear seat heat duct (not shown) is connected to the rear seat heat outlet 63. The rear seat heat duct extends to the vicinity of the feet of the rear seat occupant.

  The front seat heat outlet 62 and the rear seat heat outlet 63 are opened and closed by a common heat damper 35. The heat damper 35 is a butterfly damper configured in the same manner as the defroster damper 33, and includes a rotation shaft 35a extending in the left-right direction and blocking plates 35b and 35b. The rotation shaft 35 a is rotatably supported on the left and right side walls of the air conditioning casing 36.

  Further, a rear seat vent duct 64 is formed on the rear side of the air conditioning casing 36. The rear seat vent duct 64 extends to the rear seat.

  The rotation shafts 33a, 34a, and 35a of the defroster damper 33, the vent damper 34, and the heat damper 35 are connected and interlocked by a link mechanism (not shown). An output shaft of an actuator (not shown) is connected to the link mechanism, and the defroster damper 33, the vent damper 34, and the heat damper 35 are rotated by the operation of the actuator.

  For example, as shown in FIG. 2, when the defroster outlet 60 is closed and the vent outlet 61 and the heat outlets 62 and 63 are opened, the conditioned air is supplied to the occupant's upper body and feet. It becomes.

  In addition, as shown in FIG. 3, when the vent outlet 61 is closed and the defroster outlet 60 and the heat outlets 62 and 63 are opened, the deflated airflow is supplied to the inner surface of the front window and the feet of the occupant. It becomes foot mode.

  In addition, although not shown, the vent mode in which the vent outlet 61 is opened and the defroster outlet 60 and the heat outlets 62 and 63 are closed, the heat outlets 62 and 63 are opened, and the defroster outlet 60 is opened. And the heat mode which the vent blower outlet 61 is closed can also be switched. The blowing mode of the air conditioner 1 may be switched automatically by the air conditioning control device, or may be switched by the occupant according to preference.

  The bypass passage opening / closing damper 37 is disposed inside the bypass passage 57. The bypass passage opening / closing damper 37 is a so-called butterfly damper provided with a rotating shaft 37a extending in the left-right direction and blocking plates 37b, 37b extending on both sides in the radial direction of the rotating shaft 37a. The rotation shaft 37a is rotatably supported on the left and right side walls of the air conditioning casing 36, and is driven by an actuator (not shown). The closing plate 37b rotates around the rotation shaft 37a and can be switched from the closed state to the opened state.

  Specifically, the actuator is controlled by an air conditioning control device. The air conditioning control device operates the actuator to close the bypass passage opening / closing damper 37 when the air conditioning device 1 is in the bi-level mode and the vent mode, while bypassing when the air conditioning device 1 is in the differential heat mode and the heat mode. The actuator is operated so as to open the passage opening / closing damper 37.

  The bypass passage opening / closing damper 37 may be a cantilever damper having one closing plate 37b, a rotary damper, or the like.

  Next, the operation of the air conditioner 1 configured as described above will be described. First, the case where the air conditioner 1 is in the differential heat mode (shown in FIG. 3) will be described.

  The air conditioning control device issues a command to the actuator, and rotates the air mix damper 32 so that the conditioned air generated in the air mix space 55 has a desired temperature. Air conditioning air blown from the blower unit 3 flows through the intermediate duct 5, and the entire amount flows into the cooling passage 51. Thereafter, the air mix damper 32 flows into the cooling passage 51 and the heating passage 53 according to the rotational position of the air mix damper 32. When the air mix damper 32 fully closes the upper opening 52a, the entire amount of air-conditioning air that has passed through the evaporator 30 flows into the heating passage 53, and the air mix damper 32 moves to the lower opening 52b. In the state where is fully closed, the air-conditioning air does not flow into the heating passage 53.

  Further, in the differential heat mode, since the bypass passage opening / closing damper 37 is in an open state, a part of the air-conditioning air flowing into the cooling passage 51 flows through the bypass passage 57 and passes through the evaporator 30. Instead, it flows into the heating passage 53 and passes through the heater core 31.

  A part of the air-conditioning air on the upstream side of the cooling passage 51 flows through the bypass passage 57 and flows into the heating passage 53, so that compared with the case where there is no bypass passage 57, the upper opening 52 a enters the air mix space 55. The pressure of the cold air that blows out decreases. Further, since there is no obstacle in air flow such as a heat exchanger in the bypass passage 57, the air conditioning air blown from the blower unit 3 almost flows into the heating passage 53 as it is. Compared with the case where there is no bypass passage 57, the pressure of the hot air blown out from the heating passage 53 to the air mix space 55 increases.

  As a result, the pressure difference between the cool air flowing from the cooling passage 51 into the air mix space 55 and the warm air flowing from the heating passage 53 into the air mix space 55 is reduced, so that the air mix damper 32 is operated at the time of temperature control and the cooling passage When 51 is slightly opened, the phenomenon of cold air flowing into the air mix space 55 is suppressed, and the temperature of the conditioned air is gradually reduced. Thereby, the relationship between the opening degree of the air mix damper 32 and temperature control can be approximated linearly.

  Further, since the bypass passage 57 communicates with the lower portion of the heating passage 53, the air blown out from the bypass passage 57 to the heating passage 53 promotes the upward flow of the heating passage 53 toward the downstream side of the heater core 31. Act on. As a result, in the air mix space 55, it is possible to sufficiently mix the cool air and the warm air by hitting the cool air with the warm air.

  And the conditioned air produced | generated in the air mix space 55 blows off from the defroster blower outlet 60 and the heat blower outlets 62 and 63, and is supplied to each part of a vehicle interior. At this time, since the cold air and the warm air are well mixed in the air mix space 55 as described above, the temperature difference between the conditioned air blown out from the defroster outlet 60 and the heat outlets 62 and 63 becomes small.

  Even in the heat mode, the bypass passage opening / closing damper 37 is opened, so that the cool air flowing from the cooling passage 51 into the air mix space 55 and the air mix space 55 from the heating passage 53 are the same as in the differential heat mode. The pressure difference from the warm air flowing into the air becomes smaller, and therefore the relationship between the opening degree of the air mix damper 32 and the temperature control can be made closer to linear.

  On the other hand, as shown in FIG. 2, when the air conditioner 1 is in the bi-level mode, the bypass passage opening / closing damper 37 is closed. In the bi-level mode, conditioned air is supplied to the upper body and feet of the occupant. At this time, considering the comfort of the occupant, the temperature of the conditioned air blown out from the vent outlet 61 is set as the heat outlet 62, 63. It is preferable to perform so-called cold head heat conditioning, which is set to be lower than the temperature of the conditioned air blown out from.

  In the bi-level mode, since the bypass passage 57 is closed, the pressure of the warm air blown into the air mix space 55 is lower than in the differential heat mode. For this reason, cold air is unevenly distributed in the upper part of the air mix space 55, and warm air is unevenly distributed in the lower part. Since the vent air outlet 61 communicates with the upper part of the air mix space 55, conditioned air having a relatively low temperature is blown out from the vent air outlet 61, while the heat air outlets 62, 63 are provided below the air mix space 55. Therefore, the conditioned air having a relatively high temperature is blown out from the heat outlets 62 and 63. Thereby, heating of head cold foot heat can be performed.

  As described above, according to the air conditioner 1 according to the first embodiment, the bypass passage 57 that bypasses the evaporator 30 is communicated with the heating passage 53, so that the cold air that flows from the cooling passage 51 into the air mix space 55. And the pressure difference with the warm air which flows into the air mix space 55 from the heating channel | path 53 can be made small. Thereby, the relationship between the opening degree of the air mix damper 32 and temperature control can be approximated linearly.

  Further, the temperature of the conditioned air can be positively controlled by opening and closing the bypass passage 57 in accordance with the blowing mode.

  In addition, the heating passage 53 is defined below the air mix space 55, the downstream side of the heating passage 53 communicates with the lower portion of the air mix space 55, and the downstream side of the bypass passage 57 communicates with the lower portion of the heating passage 53. Therefore, the air in the bypass passage 57 can be smoothly introduced into the air mix space 55 by being put on the air flow in the heating passage 53.

  In addition, when the drain pipe 49 is provided in the left-right direction center part of the air-conditioning casing 36 like the modification 1 shown in FIG. 4, the drainage channel 48a of condensed water is formed near the center of the left-right direction, and this drainage channel 48a. Alternatively, the bypass passages 57 may be formed on the left side and the right side, respectively. In this case, since the bypass passages 57 and 57 are formed on both the left and right sides, the difference in the air volume in the left and right direction in the air conditioning casing 36 can be reduced.

  Moreover, you may provide the drain pipe 49 on the right side of the air-conditioning casing 36 like the modification 2 shown in FIG. In this case, the condensed water drainage passage 48a is formed on the right side, and the bypass passage 57 is formed on the left side.

  Moreover, you may provide the drain pipe 49 in the left side of the air-conditioning casing 36 like the modification 3 shown in FIG. In this case, the condensed water drainage channel 48a is formed on the left side, and the bypass channel 57 is formed on the right side.

(Embodiment 2)
FIG. 7 shows an air conditioner 1 according to Embodiment 2 of the present invention. The air conditioner 1 of the second embodiment is different from that of the first embodiment in that the bypass passage opening / closing damper 37 is not provided, and the other parts are the same as those of the first embodiment. Will be described.

  That is, in the second embodiment, air in the cooling passage 51 flows from the bypass passage 57 into the heating passage 53 regardless of the blowing mode of the air conditioner 1. Therefore, even in the differential heat mode or the bi-level mode other than the heat mode, the pressure difference between the cold air flowing from the cooling passage 51 into the air mix space 55 and the warm air flowing from the heating passage 53 into the air mix space 55 is small. Become. Thereby, when the air mix damper 32 is operated at the time of temperature control and the cooling passage 51 is slightly opened, a phenomenon in which the cold air flows into the air mix space 55 is suppressed, and the temperature of the conditioned air is gradually reduced. Thereby, even if it is blowing modes other than differential heat mode, the relationship between the opening degree of the air mix damper 32 and temperature control can be approximated linearly.

  Further, air always flows from the bypass passage 57 to the heating passage 53. Therefore, in any blowing mode, the hot air blown from the heating passage 53 to the air mix space 55 and the cold air blown from the upper opening 52 to the air mix space 55 are collided to sufficiently mix the cold air and the hot air. be able to. Thereby, this can be realized when it is desired to reduce the temperature difference between the conditioned air blown from the vent outlet 61 and the conditioned air blown from the heat outlets 62 and 63 in the bi-level mode.

  Also in the second embodiment, the drain pipe 49 may be provided and the bypass passage 57 may be formed as in the first to third modifications of the first embodiment.

(Embodiment 3)
FIG. 8 shows an air conditioner 1 according to Embodiment 3 of the present invention. The air conditioner 1 of the third embodiment is different from that of the first embodiment in that a bypass passage 57 is formed by a duct 70 provided outside the air conditioning casing 36, and the other is the same as the first embodiment. Hereinafter, a different part from Embodiment 1 is demonstrated.

  That is, in this embodiment, the inside of the duct 70 is a bypass passage 57. The duct 70 is provided on the left side of the air conditioning casing 36, that is, on the air blowing unit 3 side. The upstream side of the duct 70 branches off from the intermediate duct 5, and the bypass passage 57 is connected to the internal passage of the intermediate duct 5. The downstream side of the duct 70 passes through the left side wall portion of the air conditioning casing 36 and is connected to the upstream side of the heater core 31 in the heating passage 53. Further, the duct 70 extends along the left side wall portion of the air conditioning casing 36. The arrows indicate the flow of air conditioning air flowing to the bypass passage 57.

  In the third embodiment, as in the first and second embodiments, the bypass passage 57 that bypasses the evaporator 30 is communicated with the heating passage 53, and therefore, the cold air that flows from the cooling passage 51 into the air mix space 55 and the heating passage 53. Thus, the pressure difference from the warm air flowing into the air mix space 55 can be reduced. Thereby, the relationship between the opening degree of the air mix damper 32 and temperature control can be approximated linearly.

  Further, since the upstream side of the bypass passage 57 is connected to the intermediate duct 5 for introducing the air-conditioning air sent from the blower unit 3 into the air-conditioning casing 36, the air in the intermediate duct 5 is divided into the bypass passage 57. It will be. Therefore, it is possible to cope with a simple structure when the amount of air to be bypassed is small.

(Embodiment 4)
FIG. 9 shows an air conditioner 1 according to Embodiment 4 of the present invention. The air conditioner 1 of the fourth embodiment is different from that of the first embodiment in that the bypass passage 57 is formed by the duct 71 provided outside the air conditioning casing 36, and the other is the same as the first embodiment. Hereinafter, a different part from Embodiment 1 is demonstrated.

  That is, in this embodiment, the inside of the duct 71 is a bypass passage 57, and this duct 71 is provided on the right side of the air conditioning casing 36.

  The upstream side of the duct 71 passes through the right side wall portion of the air conditioning casing 36 and is connected to a portion upstream of the evaporator 30 in the cooling passage 51. The downstream side of the duct 71 passes through the right side wall portion of the air conditioning casing 36 and is connected to the upstream side of the heater core 31 in the heating passage 53. Further, the duct 71 extends along the right side wall portion of the air conditioning casing 36.

  In the air conditioning casing 36, the air-conditioning air blown from the blower unit 3 flows vigorously from the left side to the right side. Since the upstream side of the duct 71 penetrates the right side wall portion of the air conditioning casing 36, the air for air conditioning blown from the blower unit 3 easily flows into the duct 71, and a sufficient amount can be secured.

  In the fourth embodiment, similarly to the first and second embodiments, the bypass passage 57 extending by bypassing the evaporator 30 is communicated with the heating passage 53, so that the cold air flowing from the cooling passage 51 into the air mix space 55 and the heating passage 53 are connected. Thus, the pressure difference from the warm air flowing into the air mix space 55 can be reduced. Thereby, the relationship between the opening degree of the air mix damper 32 and temperature control can be approximated linearly.

(Embodiment 5)
FIG. 10 shows an air conditioner 1 according to Embodiment 5 of the present invention. The air conditioner 1 of the fifth embodiment is different from that of the first embodiment in that a bypass passage 57 is formed on the left side of the evaporator 30 inside the air conditioning casing 36, and the others are the same as those of the first embodiment. A portion different from the first embodiment will be described.

  That is, in the fifth embodiment, the dimension in the left-right direction of the evaporator 30 is set shorter than that in the first embodiment. The evaporator 30 is arranged in a state of being moved to the right side in the air conditioning casing 36, and a bypass passage 57 extending in the front-rear direction is formed between the left side surface of the evaporator 30 and the inner surface of the left side wall portion of the air conditioning casing 36. Yes.

  By forming the bypass passage 57 on the left side in the air conditioning casing 36, the vertical dimension of the air conditioner 1 can be shortened compared to the case where it is formed on the lower side as in the first embodiment.

  Further, in this embodiment, since the air flow only bends at the portion flowing into the bypass passage 57 from the cooling passage 51, the number of bent portions is reduced as compared with the case where the ducts 70 and 71 of the third and fourth embodiments are provided. Air conditioning air easily flows into the bypass passage 57.

  In the fifth embodiment, similarly to the first and second embodiments, the bypass passage 57 extending by bypassing the evaporator 30 is communicated with the heating passage 53, so that the cold air flowing from the cooling passage 51 into the air mix space 55 and the heating passage 53 are provided. Thus, the pressure difference from the warm air flowing into the air mix space 55 can be reduced. Thereby, the relationship between the opening degree of the air mix damper 32 and temperature control can be approximated linearly.

  Note that the bypass passage 57 may be formed on the right side in the air conditioning casing 36 as in the modification shown in FIG. In this case, the evaporator 30 may be arranged close to the left side.

  Moreover, in the said Embodiment 1, 2, although the case where this invention was applied to what is called a semi-center type air conditioner 1 arrange | positioned so that the ventilation unit 3 and the air conditioning unit 4 may be located in a line with the left-right direction was demonstrated, For example, the present invention can also be applied to a full-center type air conditioner in which a blower, a cooling heat exchanger, and a heat exchanger for heating are arranged in a substantially central portion in the left-right direction of the vehicle.

  As described above, the vehicle air conditioner according to the present invention is suitable for mounting in the passenger compartment of a passenger car, for example.

DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 3 Blower unit 4 Air conditioner unit 5 Intermediate duct 10 Blower fan (blower)
30 Evaporator (cooling heat exchanger)
31 Heater core (heat exchanger for heating)
36 Air conditioning casing 37 Bypass passage opening / closing damper (opening / closing member)
32 Air mix damper 51 Cooling passage 53 Heating passage 55 Air mix space 57 Bypass passages 70 and 71 Duct

Claims (5)

A cooling heat exchanger for cooling the air-conditioning air;
A heat exchanger for heating air for air conditioning,
A casing that houses the cooling heat exchanger and the heating heat exchanger,
In the vehicle air conditioner configured to supply the air conditioning air introduced into the casing through the cooling heat exchanger and the heating heat exchanger as conditioned air and then supply the conditioned air to the vehicle interior.
In the casing, a cooling passage in which the cooling heat exchanger is disposed, a heating passage in communication with a portion of the cooling passage downstream and the heating heat exchanger is disposed, and the cooling passage An air mix space where the other downstream portion and the downstream end of the heating passage communicate with each other and a portion where the cooling heat exchanger is disposed in the cooling passage are formed so as to extend and communicate with the heating passage. And an air mix damper that changes the ratio of the amount of cool air flowing from the cooling passage into the air mix space and the amount of hot air flowing from the heating passage into the air mix space is disposed. An air conditioner for a vehicle characterized by the above. In the vehicle air conditioner according to claim 1,
An opening and closing member for opening and closing the bypass passage is disposed in the casing. The vehicle air conditioner according to claim 1 or 2,
The heating passage is partitioned and formed below the air mix space,
The downstream side of the heating passage communicates with the lower part of the air mix space,
The vehicle air conditioner characterized in that a downstream side of the bypass passage communicates with a lower portion of the heating passage. In the vehicle air conditioner according to any one of claims 1 to 3,
It has a blower that blows air for air conditioning,
The blower is arranged so as to be arranged at an interval on one side in the vehicle width direction of the casing that houses the cooling and heating heat exchangers,
The casing is connected to a duct for introducing the air-conditioning air blown from the blower into the casing.
An air conditioner for vehicles, wherein the upstream side of the bypass passage is connected to the duct. In the vehicle air conditioner according to any one of claims 1 to 3,
It has a blower that blows air for air conditioning,
The blower is arranged so as to be arranged at an interval on one side in the vehicle width direction of the casing that houses the cooling and heating heat exchangers,
The vehicle air conditioner characterized in that the upstream side of the bypass passage communicates with the downstream side in the flow direction of the air blown from the blower in the casing.

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